Diane Rehm interviewed Daniel Gilbert, author of a very interesting book called Stumbling on Happiness. Definitely not a self-help book! Gilbert draws on psychology, cognitive neuroscience, philosophy and behavioral economics to construct a funny/poignant explanation of how and why people are so hapless at making themselves happy.
On the other hand, the leaders of remote Bhutan decided in 1972 that they could increase the chances that citizens would enjoy happiness--so Bhutan became the first (and so far only) country to institute a national happiness policy. Find out more at BBC News, where there is not only a pretty slide show, but also an array of links, articles, and nifty videos that explore happiness from various angles. (Skip the quiz--it's absurd.)